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kernel: get rid of unused interrupt_registers

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process_t member was never set, but was referenced in ptrace
core-local member was set in x86-64 but never used
This commit is contained in:
K. Lange 2023-10-05 16:32:54 +09:00
parent 023b078d0e
commit 4f36cac62c
3 changed files with 2 additions and 10 deletions
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3
base/usr/include/kernel/process.h
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@ -117,7 +117,6 @@ typedef struct process {
tree_node_t * tree_entry;
struct regs * syscall_registers;
struct regs * interrupt_registers;
list_t * wait_queue;
list_t * shm_mappings;
list_t * node_waits;
@ -202,8 +201,6 @@ struct ProcessorLocal {
int cpu_id;
union PML * current_pml;
struct regs * interrupt_registers;
#ifdef __x86_64__
int lapic_id;
/* Processor information loaded at startup. */

1
kernel/arch/x86_64/idt.c
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@ -678,7 +678,6 @@ struct regs * isr_handler_inner(struct regs * r) {
struct regs * isr_handler(struct regs * r) {
int from_userspace = r->cs != 0x08;
this_core->interrupt_registers = r;
if (from_userspace && this_core->current_process) {
this_core->current_process->time_switch = arch_perf_timer();

8
kernel/sys/ptrace.c
View File

@ -248,10 +248,6 @@ long ptrace_detach(pid_t pid, int sig) {
* Copies the interrupt register context of the tracee into a tracer-provided
* address. The size, meaning, and layout of the data copied is architecture-dependent.
*
* Currently this is either @c interrupt_registers or @c syscall_registers, depending
* on what is available. Since the tracee needs to be suspended this should represent
* the actual userspace register context when it resumes.
*
* On AArch64 we also add ELR, which isn't in the interrupt or syscall register contexts,
* but pushed somewhere else...
*
@ -268,7 +264,7 @@ long ptrace_getregs(pid_t pid, void * data) {
if (!tracee || (tracee->tracer != this_core->current_process->id) || !(tracee->flags & PROC_FLAG_SUSPENDED)) return -ESRCH;
/* Copy registers */
memcpy(data, tracee->interrupt_registers ? tracee->interrupt_registers : tracee->syscall_registers, sizeof(struct regs));
memcpy(data, tracee->syscall_registers, sizeof(struct regs));
#ifdef __aarch64__
memcpy((char*)data + sizeof(struct regs), &tracee->thread.context.saved[10], sizeof(uintptr_t));
#endif
@ -398,7 +394,7 @@ long ptrace_singlestep(pid_t pid, int sig) {
/* arch_set_singlestep? */
#if defined(__x86_64__)
struct regs * target = tracee->interrupt_registers ? tracee->interrupt_registers : tracee->syscall_registers;
struct regs * target = tracee->syscall_registers;
target->rflags |= (1 << 8);
#elif defined(__aarch64__)
tracee->thread.context.saved[11] |= (1 << 21);